[ORC] Remove the optional MaterializationResponsibility argument from lookup.

The lookup function provides blocking symbol resolution for JIT clients (not
layers themselves) so it does not need to track symbol dependencies via a
MaterializationResponsibility.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332897 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed